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Abstract:

A single-column model of the evolving stable boundary layer is tested for the consistency of turbulence parameterization, effects of ambient forcing, and self-similar properties of the flow. The turbulence closure of the model is based on the K-theory approach, with stability functions based on empirical data, and a semi-empirical form of the mixing length. The model has one internal, governing stability parameter, the Richardson number Ri, which dynamically adjusts to the boundary conditions and to external forcing. Model results, expressed in terms of local similarity scales, are universal functions of the Richardson number, and satisfied in the entire stable boundary layer, for all instants of time, and all kinds of external forcing.